EP2508764B1 - Tube form assembly and method for assembling a tube form assembly - Google Patents

Tube form assembly and method for assembling a tube form assembly Download PDF

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Publication number
EP2508764B1
EP2508764B1 EP12162386.2A EP12162386A EP2508764B1 EP 2508764 B1 EP2508764 B1 EP 2508764B1 EP 12162386 A EP12162386 A EP 12162386A EP 2508764 B1 EP2508764 B1 EP 2508764B1
Authority
EP
European Patent Office
Prior art keywords
adhesive
tube form
form assembly
cavity
inner member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP12162386.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2508764A1 (en
Inventor
Daniel P. Sottiaux
Frank B. Stamps
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bell Helicopter Textron Inc
Original Assignee
Bell Helicopter Textron Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bell Helicopter Textron Inc filed Critical Bell Helicopter Textron Inc
Publication of EP2508764A1 publication Critical patent/EP2508764A1/en
Application granted granted Critical
Publication of EP2508764B1 publication Critical patent/EP2508764B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
    • F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
    • F16B11/008—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing of tubular elements or rods in coaxial engagement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
    • B64D27/40—Arrangements for mounting power plants in aircraft
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
    • F16B2200/60—Coupler sealing means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/34—Branched
    • Y10T403/341—Three or more radiating members
    • Y10T403/342—Polyhedral
    • Y10T403/343—Unilateral of plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/47—Molded joint
    • Y10T403/473—Socket or open cup for bonding material

Definitions

  • the present application relates to a method and apparatus for an adhesive joint that controls the adhesive bond during assembly.
  • Tube form assemblies are particularly useful in many aerospace structures.
  • a tube form assembly according to the preamble of claim 1 is known from document FR 2 677 723 A .
  • a typical tube form assembly includes an outer cylindrical member bonded to an inner cylindrical member.
  • the structural integrity of the tube form assembly relies in part on the quality of the adhesive bond between the outer cylindrical member and the inner cylindrical member.
  • Conventional assembly methods allow for the introduction of air bubbles in the adhesive. Air bubbles in the adhesive result in voids in the adhesive bond line, thereby decreasing the bond strength. Voids in the adhesive bond line may lead to failure to the tube form assembly. If the tube form assembly is a flight critical part on an aircraft, failure of the bond can lead to catastrophic results.
  • FR 2019232 discloses a tubular body, such as pipe fittings on tubular bodies, that are adhesively bonded together.
  • a first aspect of the invention provides a tube form assembly according to claim 1.
  • the volume of the cavity may be configured to contain a surplus amount of adhesive.
  • the tube form assembly may further comprise:
  • the inner member and the outer member may be cylindrically shaped.
  • a second aspect of the invention provides a method for assembling a tube form according to claim 5.
  • the adhesive may be a paste adhesive.
  • the method may further comprise: removing an excess adhesive.
  • the step of pressing the inner member and the outer member may also include restricting the outer member and the inner member in a radial direction.
  • the step of pressing the inner member and the outer member together may include a translation of the inner member relative to the outer member along a central axis of the tube form assembly.
  • the method may further comprise: curing the adhesive.
  • the cavity may be formed by a first step in the inner member and a second step in the outer member.
  • the step of pressing the inner member and the outer member together so that a volume of the cavity decreases may include expelling any air bubbles in the adhesive by the resulting increase in pressure in the cavity.
  • the cavity may be located at a uniform radius from a central axis of the tube form assembly.
  • the tube form assembly may be a link for an aircraft, e.g. a gearbox pylon mounting link for an aircraft.
  • Rotorcraft 101 has a rotor system 103 with a plurality of rotor blades 111.
  • the pitch of each rotor blade 111 can be selectively controlled by a pitch link 113 in order to selectively control direction, thrust, and lift of rotorcraft 101.
  • Rotorcraft 101 further includes a fuselage 105, landing gear 107, and an empennage 109.
  • Tiltrotor aircraft 201 includes a fuselage 207, a landing gear 209, a wing 205, and rotatable nacelles 203a and 203b.
  • Each nacelle 203a and 203b includes a plurality of rotor blades 211.
  • the position of nacelles 203a and 203b, as well as the pitch of rotor blades 211, can be selectively controlled in order to selectively control direction, thrust, and lift of tiltrotor aircraft 201.
  • Illustrative tube form assemblies can include: a pitch link, a vibration isolator, control link, a pitch restraint link, a lead/lag damper, to name a few.
  • the system and method of the present application may be utilized to manufacture tube form assemblies for rotorcraft 101 and tiltrotor aircraft 201.
  • the system and method of the present application may be utilized to manufacture tube form assemblies on other types of aircraft, as well as non-aircraft applications.
  • the system and method of the present application may be utilized to manufacture a tube form assembly on a space vehicle, ground vehicle, surface marine vehicle, amphibious marine vehicle, and submersible marine vehicle, to name a few examples.
  • the system of the present application includes a tube form assembly with components that are configured to self pump adhesive to the bond line during the assembly process.
  • the self pumping of adhesive expels air bubbles, thereby minimizing voids in the adhesive bond line.
  • the aforementioned features of tube form assembly are described further herein.
  • the method of the present application includes steps for assembling a tube form assembly so as to expel any air bubbles in the adhesive, thereby minimizing voids in the adhesive bond line.
  • Tube form assembly 301 is illustrated in progressive assembly views.
  • Tube form assembly 301 includes an outer member 303 and an inner member 305.
  • Inner member 305 and outer member 303 are bonded together with adhesive 313 (shown in Figures 6-8 ).
  • Adhesive 313 is preferably a paste adhesive, or other adhesive that exhibits pre-cure fluid properties during assembly of components of tube form assembly 301.
  • adhesive 313 is EA 9346 paste adhesive manufactured by Henkel and Hysol Corporations. It should be appreciated that exact type of adhesive 313 is implementation specific.
  • each of the outer member 303 and inner member 305 are cylindrically shaped.
  • outer member 303 and inner member 305 may also have interlocking and/or mating features, such as splined, keyed, and/or threaded portions.
  • the tube form assembly 301 may be a spring structure configured to treat dynamic loading generated by rotor system 103 in rotorcraft 101.
  • An elastomer member 311 provides the spring constant to treat forces in the load path between inner member 305 and outer member 303.
  • a first attachment member 321 and a second attachment member 323 are configured for attaching tube form assembly 301 to structures that exhibit relative oscillatory motion or forces therebetween.
  • Elastomer member 311 is attached between an inner surface of inner member 305 and an outer surface of first attachment member 321.
  • tube form assembly can be a gearbox pylon mounting link that provides structural support and vibration attenuation between the gearbox pylon and the aircraft structure.
  • tube form assembly 301 is merely exemplary of a wide variety of tube form assembly structures.
  • tube form assembly 301 can include fluid reservoirs with one or more fluid passages that are configured to provide fluid damping and/or isolation as the fluid is forced back and forth between the fluid reservoirs.
  • the inner member 305 has an inner offset 307.
  • outer member 303 has an outer offset 309.
  • Inner offset 307 is a physical change in the size of the outer periphery or outer surface of inner member 305.
  • inner offset 307 represents a step change in the outer diameter of inner member 305.
  • Outer offset 309 is a physical change in the size of the inner periphery or inner surface of outer member 303.
  • outer offset 309 represents a step change in the inner diameter of outer member 303.
  • inner offset 307 and outer offset 309 form a cavity 315 therebetween when inner member 305 and outer member 303 are mated together.
  • each offset 307 and 309 includes an arcuate or radius surface in the step change transition.
  • the volume of cavity 315 decreases during assembly of inner member 305 and outer member 303.
  • Cavity 315 acts as an integral adhesive pump that pumps adhesive 313 outward as inner member 305 and outer member 303 are assembled together, as discussed further herein.
  • FIG. 6-8 a partial sectional view of tube form assembly 301 is illustrated.
  • Figures 6-8 progressively illustrate the process for assembling tube form assembly 301.
  • adhesive 313 is deposited in the cavity 315, as well as portions of bonding surfaces 317a, 317b, 319a, and 319b.
  • inner member 305 and outer member 303 are translated together along lengthwise centerline axis.
  • the volume of cavity 315 is defined by the width W3 and length L1.
  • a volume of high pressure is created in cavity 315.
  • the increase in pressure causes adhesive 313 to flow toward the extremities.
  • cavity 315 acts as an integral pump by pumping adhesive 313 outward as inner member 305 and outer member 303 are squeezed together. During this assembly procedure, air bubbles are also squeezed out along with excess adhesive. Further, as the volume of cavity 315 decreases, the resulting increase in pressure causes compressible air bubbles in adhesive 313 to migrate toward zones of lower pressure outward from cavity 315. Furthermore, the flow of adhesive outward acts to prevent air bubbles from being suctioned from the exterior into the bondlines between bond surfaces 317a and 319a, as well as the bondlines between bond surfaces 317b and 319b.
  • inner member 305 and outer member 303 are illustrated in a final assembly position.
  • Excess adhesive 313a and 313b has been squeezed out, along with air bubbles.
  • the dimensions W1 and W2 are the thickness between bond surfaces 317a and 319a, as well as between bond surfaces 317b and 319b.
  • W1 and W2 are approximately 0.13 mm (0.005 inch).
  • the exact dimensions W1 and W2 are implementation specific.
  • specific paste adhesives have specific optimal bond thickness or ranges of thickness. As such, it is preferred that thickness W1 and W2 are selectively tailored in accordance with the specific adhesive 313 being used.
  • adhesive 313 can be cured in accordance with the implementation specific requirements of the adhesive 313.
  • Tube form assembly 901 is substantially similar to tube form assembly 301, except for including a seal 903.
  • Seal 903 acts to cause adhesive 313 to be squeezed out only one direction. Seal 903 is particularly useful in embodiments having a closed end which would prevent a manufacturer from having access to clean and remove adhesive that would otherwise squeeze out in the area of seal 903.
  • Tube form assembly 1001 is illustrated.
  • Tube form assembly 1001 is substantially similar to tube form assembly 301 except inner offset 307 and outer offset 309 are replaced with an inner tapered surface 1003 and an outer tapered surface 1005, respectively.
  • a cavity similar to cavity 315, is formed between the tapered surfaces 1003 and 1005.
  • adhesive 313 is squeezed out as inner member 305 and outer member 303 are squeezed together.
  • Tube form assembly 1001 is exemplary of a wide variety of volume shapes that cavity 315 can form.
  • a step 1103 includes providing an inner member and an outer member that form a cavity therebetween.
  • An exemplary inner member and outer member are illustrated in Figures 3-10 , and further described herein.
  • a step 1105 includes locating an uncured adhesive in the cavity and on the bonding surfaces. Step 1105 is illustrated in Figure 6 , and further described herein.
  • a step 1107 includes pressing the inner member and the outer member together so as to force a portion of the adhesive out of the cavity. Step 1107 is illustrated in Figure 7 and 8 , and further described herein.
  • the inner member and outer member are each attached to tooling so that the translation of inner member and outer member is maintained along an axial centerline of the tube form assembly.
  • a step 1109 is an optional step that includes removing the excess adhesive from the tube form assembly. The excess assembly is illustrated at least in Figure 8 .
  • a step 1111 includes curing the adhesive so that inner member and outer member are securedly bonded together. The exact curing process is implementation specific, as different adhesives require different curing processes, as one of ordinary skill in the art will fully appreciate with benefit of this disclosure. For example, step 1111 can include subjecting the adhesive to an elevated temperature for a duration of time.
  • the disclosed tube form assembly, and method of making the same provide significant advantages, including: 1) providing a self pumping adhesive joint which prevents drawing air bubbles into the bond line during assembly; and 2) providing a self pumping adhesive joint which expels air bubbles during assembly.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Standing Axle, Rod, Or Tube Structures Coupled By Welding, Adhesion, Or Deposition (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
EP12162386.2A 2011-04-04 2012-03-30 Tube form assembly and method for assembling a tube form assembly Active EP2508764B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161471232P 2011-04-04 2011-04-04
US13/430,117 US9382933B2 (en) 2011-04-04 2012-03-26 Self pumping and priming adhesive joint system

Publications (2)

Publication Number Publication Date
EP2508764A1 EP2508764A1 (en) 2012-10-10
EP2508764B1 true EP2508764B1 (en) 2014-07-16

Family

ID=45954441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12162386.2A Active EP2508764B1 (en) 2011-04-04 2012-03-30 Tube form assembly and method for assembling a tube form assembly

Country Status (6)

Country Link
US (1) US9382933B2 (zh)
EP (1) EP2508764B1 (zh)
CN (1) CN102729580B (zh)
BR (1) BR102012015662A2 (zh)
CA (1) CA2773175C (zh)
IN (1) IN2012DE00959A (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2997034B1 (fr) 2012-10-18 2015-05-01 Epsilon Composite Procede de collage de deux pieces soumises a des efforts de traction, pieces collees obtenues
JP5937769B2 (ja) * 2014-05-26 2016-06-22 藤倉ゴム工業株式会社 Ｆｒｐ製駆動シャフト
EP3059163B1 (en) * 2015-02-18 2019-06-19 Safran Landing Systems UK Limited Aircraft assembly
JP6212577B2 (ja) * 2016-02-10 2017-10-11 本田技研工業株式会社 連結シャフトおよび連結シャフトの製造方法

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Also Published As

Publication number Publication date
US9382933B2 (en) 2016-07-05
CA2773175A1 (en) 2012-10-04
EP2508764A1 (en) 2012-10-10
CN102729580B (zh) 2015-09-09
CA2773175C (en) 2015-09-08
BR102012015662A2 (pt) 2015-09-22
IN2012DE00959A (zh) 2015-09-11
CN102729580A (zh) 2012-10-17
US20120251225A1 (en) 2012-10-04

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